Smelting-furnace.



PATENTED JUNE 4, 1907. E. BOSSHARDT. I SMELTING FURNACE. APPLICATION nunMAY 21, 1906.

2 SHEETS-SHEET 1 l/l/VE/V TOR,

Win o'd'sha/rd &

T 00M whom it may concern.-

- citizen of the Swiss Republic, residing at 4 highly heated airtogether with the products Which the followingis a specification.

EDWIN BOSSHARDT, OF COLOGNE, GERMANY, ASSIGNOR OF ONE-HALF TO HENRYGARDA, OF LEIPZIG, GERMANY.

SMELTING- Specification of Letters Patent.

FURNAGE.

' Patented June 4, 1907.

Application filed May 21,1906, serial No. 317.960.

Be it known that I, EDWIN BOSSHARDT, a

Eifel Platz, Cologne, in the Empire of Germany, have invented certainnew and useful Improvements in Smeltmg- Furnaces, of

This invention relates to open hearth furnaces for smelting bronze,tombac, steel and iron in large quantities.

The object of the present invention is to provide a form of open hearthfurnace which, unlike the Siemens-Martin furnace may work continuously,and more effectively, the smelting only occupying a few hours, and toprovide a furnace which may with advantage bensed in small foundries.

.According to the present invention air is passed through chambersbeneath or adjacent the hearth and after being partly heated therein is.highly-heated by being led through a furnace or furnaces, the.

of combustion from the furnace or furnaces I being led over thereverberatory hearth.

The whole furnace is arranged so that it can be tilted to enable themolten metal to be poured off, which method is preferred to emptyingthrough floss holes. The hearth is comparatively shallow so as to pesent a large surface ,to the hot gases flowing over it thereby insuringa better absorption of the same.

The accompanying drawings diagrammat--' ically illustrate a tiltingfurnace according to the invention.

Figure 1 is a front sectional elevation on a larger scale than theremaining figures. Fig. 2 is a side sectional elevation on A, B, Fig. 1.Fig. 3 is a sectional plan on C, D, Fig. 1. Fig. 4 is a sectionalplan onE, F, Fig. 1.

In the furnace illustrated the air flows from a pipe a into a centralchamber 1) beneath the hearth g, passing thence through heating chambersc, c, surrounding three; sides 70., 7c, of each of the ash-pits offurnaces f. F IOIIL the chambers c, c, the heated air flows past valvesd and through distributing passages e into the incandescent zones offurnaces f. The 'air so highly heated passes l together with products ofcombustion into l the hearth g, finally escaping through a flue l g, tothe chimney. Fig. 4 shows the course of the air and the relativepositions of the I heating chambers. l

The ash-pits below the grates i, i, are inclosed on three sides by thewalls k, it, which are heated by the fires and thereby heat the airpassing in contact with them. The fourth side of each ashpit is closedby a door it.

If aftercharging the hearth 9 it is necessary to start the furnace thevalves d, d are closed and the fires on the grates i, i are started bythe natural draft of the chimney. Nhen the side furnaces areincandescent the doors h and covers mare closed the valves d opened andthe blast introduced through. the pipe (1.

If the highly heated air is too thin, that is, is-too poor in oxygen,air may be led by bypass passages g from the chambers e to the furnace,fol instance, as indicated in dotted lines at the left hand side of Fig.1.

In order that the hearth which has an imperforate bottom, may bedischarged without cutting off the blast, the furnace is i-ncased in ametal shell and mounted on trunnions s, ,s, in bearings, 10., n, thepipe a, to which one trunnion is connected at q, working in a suitablejoint. The opposite trunnion is fitted with a handle or crank 7'.

hen the hearth is tilted, the valve tis opened and the metal flowingover the spout u is prevented from chilling by the hot gases whichescape with it.

If necessary, a blast may be introduced belowthe grates L, 71, throughclosable openings in the Walls 7r, 7c of the ashpits, the doors 71. inthis case being closed.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is 1. In combination, a smelting hearth, a

furnace on each side of and communicating with said hearth, a centralchamber beneath the hearth, other chambers connected therewith andsurrounding the ash-pits of the furnaces, the latter chambers being incommunication with the furnaces above the grates i for the purpose'ofconducting the heated air thereto and thence to the hearth.

l 2. In combination, a smelting hearth, a furnace on each'side ofand-communicating with said hearth, air chambers beneath the hearth andsurrounding the ash-pits of the furnaces, main distributing conduitsfrom said chambers to the furnaces above the grates, and by-passpassages from the chambers to the hearth.

3. The combination of a hearth, a furnace on each side of andcommunicating with the said hearth, air chambers beneath the hearth andsurrounding the ashits 0f the furnaces,

5 passages from the said 0 ambers to the furnace, and a metallic shellincasing the whole structure and'mounted on trunnions to enable thehearth to be, tilted and discharged.

' 4. The combination of a smelting hearth- 10 having a charging openingat the to and an 1 outlet at one side, furnaces at eac side ofthehearth, a casing for holding the hearth seesaw and furnaces in anorganized structure so as to cause them to move together, supportsforming bearings, and pivots mounted in the 15 bearings and carried bythe casing, whereby the hearth may be tilted and discharged.

In testimony whereof I have signed my name to this specification in thepresence of. two subscribing witnesses.

' EDWIN BOSSHARDT.

Witnesses:

ALBERT E. PARKER, J. PLANTS.

